Making them BoP is a good way of showing others that, you as a crafter, have made an awesome item for yourself. If you plan on selling the crafted item, it allows you to raise the value and demand even more of a profit.
...Be realistic please.
Nobody is going to be awestruck because someone /inspects someone and sees that they are wearing crafted items that cost Spirits of Harmony.
Just about every crafter out there would rather be able to sell their items that they can obtain at a reasonable rate than be forced to farm out - on that specific character mind you - a handful more of Motes of Harmony so that they have enough for that item. The true value of Motes/Spirits at level 90 is next to nothing because anyone who does the Tillers dailies for a couple days will be able to, literally, farm them. Any smart person does vegetable growing on non-90's, and leaves their 90's to farm up Spirits.
They aren't valuable. They aren't amazing. They aren't interesting. They're an annoying blockade that makes leveling professions, and crafting actual items you intend on using, unfun. I'm a bit tired of dumping excess resources to level professions on alts since I don't have a Spirit of Harmony to buy that one recipe, or to make that mediocre item.
Look, at the very LEAST, make them BoA. Chaos Orbs were an atrocious mistake, and these are arguably worse than they were. I'm sick of having characters with tons of Spirits I'll never use, and others desperately clinging on to every mote they get.
Spirits of Harmony alone ruined my outlook on professions for this expansion. I'm hoping you guys learn your lesson and change them soon - and PLEASE don't make the same mistake going forward.